Unit Testing and Integration Testing in real projects
I am yet to find a proper sample on how to do realistic Test Driven
Development (TDD) and how to write proper unit tests for complex
business applications, that gives you enough confidence to stop doing
manual tests anymore. Generally the samples
show you how to test a Stack or a LinkedList, which is far simpler than
testing a typical N-tier application, especially if you are using
Entity Framework or Linq to SQL or some ORM in data access layer, and
doing logging, validation, caching, error handling at middle tier.
There are many articles, blog posts, video tutorials
on how to write unit tests, which I believe are all very good starting
points. But all these examples show you basic tests, not good enough to
let your QA team go. So, let me try to show you some realistic unit and
integration test examples which should help you write tests that gives
you confidence and helps you gradually move towards TDD.
I will show you tests done on my open source project Dropthings,
which is a Web 2.0 AJAX portal built using jQuery, ASP.NET 3.5, Linq to
SQL, Dependency Injection using Unity, caching using Microsoft
Enterprise Library, Velocity and so on. Basically all the hot techs you
can grasp in one shot. The project is a typical N-tier application
where there’s a web layer, a business layer and a data access layer.
Writing unit tests, integration tests and load tests for this project
was challenging, and thus interesting to share so that you can see how
you can implement Unit Testing and Integration Testing in a real
project and gradually get into Test Driven Development.
Read
this codeproject article of mine to learn how I did Integration Tests
and Unit Tests using Behavior Driven Development approach:
Unit Testing and Integration Testing in business applications
http://www.codeproject.com/KB/testing/realtesting.aspx
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